Under second-strike-capability, one is bound by declared policy of “no-first-use,” which means they can only fire the nuclear weapon in response to a nuclear strike.

Also See

INS Arihant is India’s first indigenous nuclear submarine and would command all ships of Arihant class. This includes nuclear-powered ballistic missile submarines that were launched in 2009.

The Arihant project was undertaken by India’s Advanced Technology Vessel program under the supervision of the Prime Minister’s Office.

It also involved agencies and establishments such as the Defence Research and Development Organisation (DRDO), the Department of Atomic Energy and the Submarine Design Group of the Directorate of Naval Design, besides private companies like Larsen & Toubro.